N-set wrote:

Only yesterday I started to get some interesting results after tuning the UK crossovers. But still not near to the sound I'm getting from my electrostatic headphone setup. I assume my Dannoy setup is quite compromised: one of the original crossovers is probably dry and one speaker had little bass, B2's input crap is still not bypassed and it produces some distortion, in lieu of a better solution I'm using the C1 pre. I want to push it to a logical end: bypass B2 input commutators, make my own pre a la Anthony with 801A, treat Reds' surrounds with the UK gentleman's solution to soften them. We will see what happens then.

Edgar, I completely miss you in all of your findings and I also was thinking about 15-in toy with a pair of sunspeak passive radiators. Indeed, Tannoys reinforced by sanspeak passive radiators is a magical configuration. I wonder do you drive them with Vfet amplification or not. You're finding that given configuration spin fhase at the bottom is also very accurate, I was trying for 2 months to add exceptionally well performing lower base to it, 15 Midbass driver and I never was able to have a result which would I recognized as improvement. I have a lot of open bottle array crossed at 20 cycles and it does complement Tannoys with Scanspeak but only in Audio sence. From musical perspective, in this configuration, lower base do not add anything. I do not know why but despite exceptional audio this lower base does not add to the system it's ability to conceive metaphors. The Tannoys with scanspeak is absolutely insane configuration which act in my perception as a gorgeous woman in stunning mini skirt which make my imagination to race and guess what is underskirt. Any lower base that I was trying to add to it act as addition of constructors boots to those gorgeous legs in mini scirt. It just acts as direct violation of aesthetics. My local audio friend Bill, who experimented in the same direction went into other direction and he replaced san speak with another possivly loaded 10 inch tannoy. It is very interesting proof but I would add not another passive Red but another active Red results Twitter and another passive one or to sanspeak. That kindness that sanspeak add to the bottom of Red in my view absolutely cannot be ignored. The only one shortcomings for that kindness that I was able to observe is that that kindness to come ever present and if music call for brutal force, dry and cold execution with insane dynamics then skan speak does it a bit more polite than I would like to. It might be fun to adopt Meitner IDAT algorithm and to make super transient and super dynamic signals handled by my Macondo and the rest by Dannoy….

Paul S wrote:

For one thing, I've already spent several decades charting vintage and newer "special" drivers and sound.